3112 Instruments of Amplification by Pete Friedrichs, Shows you how to
make a microphonic relay amplifier which is really an earphone
feeding a carbon microphone to achieve an increase in signal level.
Also, shows you how to build a balance-beam amplifier which is sort
of a more advanced model of the microphonic relay. You'll get details
on experiments with spice jar glow tubes, a canning jar diode, a
tennis ball triode made from a glass votive jar, and more. You get
basic theory of triodes, semiconductors, details on Pete's surplus
vacuum pump, details on solid state experiments by others, and much
more. This is one of the most unique electronics experimentation
books to come along in decades. This is tinkering, experimentation,
and inventing at its best. 297 pages,